Natural flea repellents include black walnut supplements, herbal shampoos and diatomaceous earth, according to PETA. One natural flea killer is powdered pyrethrum, as stated by Dr. Jeffrey Levy.
Flea control often requires a holistic approach that involves not only repellents and killers, but also cleaning the home and bathing the pets. Animals that eat healthy diets packed with plenty of nutrients are less susceptible to fleas, according to PETA. Additionally, homes that are vacuumed regularly make less suitable environments for flea infestations.
Combing a pet every day to remove fleas and their eggs can also help manage the problem. Pets that are bathed regularly with herbal shampoos might not be as attractive to fleas and other parasites.